Ground water toxicity due to fluoride contamination in Southwestern Lahore, Punjab, Pakistan

Yasar, Abdullah; Javed, Tariq; Kausar, Firdaus; Shamshad, Jaweria; Khan, Muhammad Umar; Iqbal, Rashid

doi:10.2166/ws.2021.084

Cited by 10 publications

(2 citation statements)

References 58 publications

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“…Evidence indicates that F-concentration depends on the depth of the well; shallow wells are highly vulnerable to anthropogenic activities such as agricultural activities [33]. However, another study reported that the F-level decreases with increment of well depth [34]. In our study, the Adama dry season maximum F-level was 3.55mg/L while the wet season was 1.49 mg/L.…”

Section: Discussioncontrasting

confidence: 41%

Groundwater Fluoride Contamination and Human Health Risk Assessment in Ethiopia Central Rift Valley

Abera,

Aseffa,

Mengistie

et al. 2024

Preprint

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: Fluoride toxicity has become a global public health concern, and its significant source of exposure is drinking water. This study aimed to determine groundwater fluoride level and assess its related human health risks. Its level was measured from groundwater samples using an ion-selective electrode. The total hazard index was assessed based on the chronic daily oral intake and dermal absorbed dose of groundwater fluoride. Analyses were conducted using ArcGIS and SPSS. This study reported groundwater fluoride ranged from 0.3 mg/L to 38 mg/L, with a mean annual level of 15 mg/L. Groundwater fluoride level above 5 mg/L was reported in 60 % of the water samples. Total hazard index values among sampled locations varied from 0.18 to 22.56. Half (51.5 %) of infants, 85.5 % of children, 82.5 % of adolescents, and 67.5 % of adults had a risk of developing a non-carcinogenic health effect. This study demonstrated that the fluoride level of the groundwater sources was high, and the water was not suitable for drinking, a result that is of special importance for children and adults since they are a hypersensitive subgroup of the population.

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Section: Discussioncontrasting

confidence: 41%

Groundwater Fluoride Contamination and Human Health Risk Assessment in Ethiopia Central Rift Valley

Abera,

Aseffa,

Mengistie

et al. 2024

Preprint

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“…Таким чином, забруднення ґрунтових вод фтором на досліджуваній території було спричинене проникненням промислових стічних вод. Нещодавно зареєстровано деформації кісток у 1,51 мільйона населення, які проживають у західній частині провінції Пенджаб і можуть бути пов'язані з підвищеною токсичністю фтору в цьому районі [34].…”

Section: результати дослідження та їх обговоренняunclassified

Fluorosis Prevalence at Different Regions of the Earth (Literature Review)

Kaskova,

Morhun,

Vashchenko

et al. 2024

Ukr. Dent. Alm.

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The aim of the study is to analyze the literature about the fluorosis prevalence and the factors which lead to dental and bone fluorosis. The search for articles published in 2016-2023 was conducted by the authors in Scopus and Web of Science scientific data bases using the keywords “fluorosis”, “dental fluorosis”. To classify the severity of dental fluorosis, the index of developmental defects of enamel (DDE), the index of tooth surface fluorosis (TSIF), and mostly Dean’s index Thylstrup & Fejerskov Index (TFI) are used. The risk factors for dental fluorosis include living in regions with high level of fluoride, drinking water with high level of fluoride or salt fluoridation, drinking bottled water, use of fluoride toothpastes among preschool children, early weaning, and use of infant formula for long time, and, as well as, a hot climate and high fluoride content in soil and food. The studies from India and China demonstrated that the average concentration of dental fluorosis and skeletal fluorosis at fluoride contained 6 mg/l. The prevalence of dental fluorosis in NorthernTanzania, where the fluorine content in daily drinking water is 3.6 mg/l, reaches 75,22%. In Ethiopia, where fluorine content is 5.09 mg/l, the prevalence of skeletal fluorosis ranges from 55.1% to 72.4%. In Kenya, the fluoride content in drinking water reaches 72 mg/l, so the prevalence of dental fluorosis is 80%. The prevalence of dental fluorosis is lower in South Western Saudi Arabia and Iran where fluoride level is lower. In Jordan, the prevalence of dental fluorosis reaches 39.9% due to the high fluoride content in miner rocks. Skeletal fluorosis is wide spread in some areas of Pakistan due to the contamination of ground water by industrial production. The prevalence of mild dental fluorosis is 39% in New castle where water is fluoridated, and 24% in non-fluoridated Manchester in England. Dean’s index and TFI index are mostly used to classify these variety of fluorosis. Various factors affect the appearance of dental and bone fluorosis worldwide, so the prevalence of fluorosis varies from 11,1 up to 100%.

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Study on the properties of bauxite modified by acid leaching and calcination for improving fluorine removal

Liu

Zhong

Zhu

et al. 2022

Asia-Pacific J Chem Eng

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In order to improve the fluorine removal performance of bauxite, the effects of different calcination temperatures and several acids (HCl, H 2 SO 4 , H 2 C 2 O 4 ) on the fluorine removal performance of bauxite were investigated. It was found that the calcination temperature of 500 C and the modification of H 2 SO 4 had the best fluorine removal performance. Under the same experimental conditions, the fluoride removal rate of the modified bauxite could reach 99.54%, which was much higher than that of unmodified bauxite (52.69%). The adsorbent was characterized by XRD, FTIR, BET, TG/DSC, and XRF. The influence of the addition amount of adsorbent, initial concentration of fluorine, adsorption time, and temperature on fluorine removal performance was studied. The adsorption process reached equilibrium in 32 min, and the inhibition order of coexisting anions was H 2 PO 4 À < HCO 3 À < CO 3 2À < Cl À . The pseudo-secondorder kinetic model was more suitable for the fluoride removal process of modified bauxite. Thermal regeneration had better regeneration performance than alkali leaching regeneration.

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Ground water toxicity due to fluoride contamination in Southwestern Lahore, Punjab, Pakistan

Cited by 10 publications

References 58 publications

Groundwater Fluoride Contamination and Human Health Risk Assessment in Ethiopia Central Rift Valley

Groundwater Fluoride Contamination and Human Health Risk Assessment in Ethiopia Central Rift Valley

Fluorosis Prevalence at Different Regions of the Earth (Literature Review)

Study on the properties of bauxite modified by acid leaching and calcination for improving fluorine removal

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